Sergey Vladilenovich Kiriyenko (Russian: Серге́й Владиле́нович Кирие́нко) (born 26 July 1962) is a Russian statesman and politician. He served as the Prime Minister of Russia from 23 March to 23 August 1998 under President Boris Yeltsin. Currently, he is the head of Rosatom, the state nuclear energy corporation.

Sergei Kiriyenko was born in Sukhumi, the capital of the Abkhazian ASSR, and grew up in Sochi, in southern Russia. After graduation from high school, Kiriyenko enrolled in the shipbuilding faculty at the Nizhny Novgorod (Gorky) Water Transport Engineers Institute, where his divorced father taught.

Together with Nemtsov, Chubais, Irina Hakamada and Egor Gaydar, Kirienko formed the Soyuz Pravih Sil (SPS, Union of the Right forces), one of the largest Russia's liberal democrat parties. The party finished fourth on 1999 elections.

Kirienko was appointed to head Rosatom, the Federal Atomic Energy Agency, on November 30, 2005.[5] He is also chairman of the board of directors of the vertically integrated Atomenergoprom nuclear company.[6]

He said on 18 September 2006 while in Vienna, that the reactor in the Bushehr nuclear plant in Iran should be operational by September 2007 and the plant itself will be active in November 2007. He advocated President Vladimir Putin's idea of creating an international system of uranium enrichment centers. A uranium enrichment center could be operational in Russia in 2007.[7] Responding to a reporter's question, Kiriyenko said that the Bushehr power plant would not affect nuclear non-proliferation and that there was nothing preventing Iran-Russia energy cooperation. The Government of Russia planned to deliver nuclear fuel to the plant in March 2007.[8] After a delay of some three years, Kiriyenko said 21 August 2010's arrival of nuclear fuel at Iran's Bushehr I marks "an event of crucial importance" that proves that "Russia always fulfills its international obligations." Spent nuclear fuel from the plant will be sent back to Russia.[9]